158 VETERINAEY STATE BOARD 



following are specific: brain congestion; Negri bodies in the gan- 

 glion cells of the hippocampus, and other brain cells ; proliferation 

 of the endothelial cells in the capsules of the Gasserian and plexi- 

 form ganglia. 



What is the pathology of foot and mouth disease? 



In mild cases the lesions are slight and maybe overlooked. 

 In more severe cases, hypersemia and cedema are noted. Catarrhal 

 rhinitis and pneumonia, and dilatation of the heart; the heart 

 muscle may show degeneration and hemorrhagic infarcts. In 

 some cases hemorrhagic gastro-enteritis is a prominent lesion; 

 ulcers in the stomachs of cattle ; these ulcers rarely extend deeper 

 than the mucosa. Vesicles are seen on the feet, between the digits, 

 and may extend into the deeper structures, causing sloughing of the 

 hoof and necrosis of the bone. 



Describe the appearance of a case of infectious lymphangitis. 



(All cases of lymphangitis are probably of infectious origin. 

 Presuming that the interrogator refers to the so-called "epizootic 

 lymphangitis," the following answer is given.) 



It is characterized by red exuberant skin nodules (buttons, 

 boils) which burst and discharge a thick, creamy, yellowish or 

 bloody pus. The neighboring lymph plexus swells into corded lines, 

 with nodules or abscesses at irregular intervals. The infection ex- 

 tends to, and implicates the lymph-glands of the region affected and 

 pyaemia may follow. The disease is caused by a yeast fungus, 

 cryptococcus farciminosus, also known as saccharomyces farci- 

 minosus. 



A disease, caused by a sporothrix, called " sporothricosis, " pre- 

 sents practically the same picture and is frequently mistaken for 

 the former disease. Epizootic lymphangitis is unknown in this 

 country. 



Give the post-mortem lesions of Texas fever. 



Putrefaction of carcass occurs rapidly. Icteric coloration of 

 mucous membranes and tissues due to hffimoglobinaemia. Ticks may 

 be found on the body and occasionally tufts of hair matted with 

 blood. Hemorrhages beneath the skin and into the endocardium. 

 The right ventricle is distended with blood and the left ventricle 

 contracted. Liver enlarged from congestion; the spleen engorged 

 with blood ; the kidneys cedematous and blood-stained. The bladder 

 is petechiated and contains bloody urine. Congestion of the mucosa 

 of the digestive tract. The blood thin and watery with hsemoglo- 

 binaemia present. 



